CN114585530A

CN114585530A - Automobile

Info

Publication number: CN114585530A
Application number: CN201980101134.3A
Authority: CN
Inventors: 佐藤穣; 山本洋一; 米川裕毅; 山下拓也; 秋月信也; 冈本裕司; 半田雄祐
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2022-06-03
Also published as: JP7272452B2; EP4043256A4; EP4043256A1; JPWO2021070288A1; US20230249533A1; EP4043256B1; WO2021070288A1

Abstract

The present invention is provided with: a battery frame (3) that is attached to a structural member on the back side of the floor of the automobile body (2) and that houses a battery (4); and a rear suspension unit (61) that supports the rear suspension (6) and is attached to the rear floor side member (26), the rear suspension unit being attached to the rear floor side member (26) at least at each of left and right front-side attachment portions (621, 631) and each of left and right rear-side attachment portions (622, 632), and being attached to the battery frame (3) at a 1 st attachment portion (66) located further toward the vehicle front than each of the left and right front-side attachment portions (621, 631).

Description

Automobile

Technical Field

The present invention relates to an automobile, and more particularly to a mounting structure for a rear suspension of an automobile having a battery mounted on a rear side of a floor.

Background

There is known an automobile in which a battery is mounted on a rear suspension behind a floor back side of a rear floor of an automobile body (patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2004-161158

Disclosure of Invention

Problems to be solved by the invention

However, when the battery capacity is further increased in order to extend the cruising distance, the storage space behind only the rear suspension of the rear floor becomes insufficient as in the conventional case. However, when the battery is mounted in front of the rear suspension, there is a problem that the battery interferes with the mounting position of the rear suspension.

The present invention has been made to solve the problem of providing an automobile in which a battery can be mounted in front of a rear suspension without interfering with the rear suspension.

Means for solving the problems

The invention solves the problems by the following scheme: the left and right front side mounting portions and the left and right rear side mounting portions of the rear suspension assembly are mounted to the rear floor side member, and the 1 st mounting portion in front of the vehicle with respect to the left and right front side mounting portions is mounted to the battery frame.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the battery frame is firmly attached to the structural member on the floor back side of the vehicle body, the rear suspension assembly can be sufficiently supported, and the steering stability can be maintained. On the other hand, by attaching the 1 st mounting portion in front of the rear suspension assembly to the battery frame, the battery frame can be expanded rearward to the rear suspension position. As a result, the battery can be mounted in front of the rear suspension without interfering with the rear suspension.

Drawings

Fig. 1 is a perspective view showing a battery frame mounted on an automobile according to the present invention.

Fig. 2 is a perspective view showing a state in which the battery frame of fig. 1 is attached to the back side of the floor panel of the automobile body.

Fig. 3 is a sectional view taken along the line III-III of fig. 1.

Fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Fig. 5 is an enlarged sectional view showing a main portion of the bottom frame of fig. 3.

Fig. 6 is a sectional view taken along line VI-VI of fig. 1.

Fig. 7 is a bottom view showing the back side of the floor panel including the battery frame and the rear suspension of the automobile of the invention.

Fig. 8 is a bottom view showing a battery frame and a rear suspension of an automobile according to the present invention.

Fig. 9 is a plan view showing a battery frame and a rear suspension of an automobile according to the present invention.

Fig. 10 is a side view showing a battery frame and a rear suspension of an automobile of the present invention.

Fig. 11 is a view in the direction XI of fig. 9.

Fig. 12 is a sectional view taken along line XII-XII of fig. 11.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a battery frame constituting a cooling device for a vehicle-mounted battery of the present invention, fig. 2 is a perspective view showing a state in which the battery frame of fig. 1 is attached to a back side of a floor panel of a vehicle body, fig. 3 is a sectional view taken along a line III-III of fig. 1, fig. 4 is a sectional view taken along a line IV-IV of fig. 1, fig. 5 is an enlarged sectional view showing a main portion of a bottom surface frame of fig. 3, and fig. 6 is a sectional view taken along a line VI-VI of fig. 1.

An automobile 1 according to an embodiment of the present invention includes: a battery frame 3 that is attached to a structural member on the floor back side of the automobile body 2 and that houses a battery 4; and a rear suspension assembly 61 that supports the rear suspension 6 and is mounted to the rear floor side member 26.

As shown in fig. 1, the battery frame 3 includes a plate-shaped bottom surface frame 31 and a plurality of plate-shaped

side surface frames

32, 33, 34, 35 fixed to an outer peripheral portion of the bottom surface frame 31. The side frames 32 to 35 of the present embodiment are composed of 4 members, but are not limited thereto, and may be composed of less than 4 or 5 or more side frames. The bottom frame 31 and the side frames 32 to 35 are not particularly limited, but may be formed of an aluminum extrusion molded product, and when formed of an aluminum extrusion molded product, the member is excellent in heat transfer property, light weight, and noise shielding property.

Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 1, and shows a longitudinal section of the left and

right side frames

32, 33 and the front and

rear side frames

34, 35 of the battery frame 3. As shown in fig. 4, the 4 side frames 32 to 35 have substantially the same hollow cross-sectional structure having a rib 321 in part. By providing the side frames 32 to 35 with a hollow cross-sectional structure having the ribs 321 in part, a certain strength can be secured while reducing the weight.

The floor frame 31 is formed as 1 flat plate by welding and joining 6 sub-floor frames 31A to 31F divided at a dividing line along the front-rear direction of the automobile body 2. That is, 1 sub-bottom frame is formed by one extrusion molded product from the front end to the rear end of the bottom frame 31. As shown in fig. 5, the bottom frame 31 has a hollow cross-sectional structure partially including ribs 314, and is a hollow plate-shaped frame including an upper plate 311, a lower plate 312 facing the upper plate 311 through a hollow portion 313, and ribs 314 connecting the upper plate 311 and the lower plate 312 to each other in the hollow portion 313.

In particular, in the bottom surface frame 31 of the present embodiment, as shown in fig. 5, a part of the flow path 51 of the refrigerant cycle 5 is provided at a position in contact with the upper plate 311 of the hollow portion 313. Fig. 5 is an enlarged cross-sectional view showing a main portion of the bottom frame 31, and the bottom frame 31 is formed of an extrusion molded product, and therefore, the cross-sectional structure shown in fig. 5 is provided from the front end to the rear end of the bottom frame 31. Therefore, the flow path 51 is also formed from the front end to the rear end of the bottom frame 31. By providing the flow path 51 at a position in contact with the upper plate 311 of the hollow portion 313, the cooling heat of the liquid refrigerant flowing through the flow path 51 is easily transmitted to the upper plate 311. On the other hand, the cooling heat of the liquid refrigerant can be prevented from escaping from the lower plate 312 by the air in the hollow portion 313 without bringing the flow path 51 into contact with the lower plate 312.

The battery frame 3 shown in fig. 1 is formed by fixing 4 side frames 32 to 35 to the outer periphery of a bottom frame 31 by welding or the like, and the battery 4 is accommodated in a space surrounded by the bottom frame 31, a floor back side 21 of an automobile body 2 facing the bottom frame 31, and the 4 side frames 32 to 35 in a state of being in contact with at least one of the bottom frame 31 and the side frames 32 to 35. Reference numeral 36 shown in fig. 1 is a partition plate fixed to the upper surface of the bottom surface frame 31 by means of weld bonding or the like.

The battery 4 (also referred to as a battery pack) includes a plurality of battery modules 41, and each battery module is housed in a rectangular parallelepiped module case. Although not shown, a plurality of thin batteries (also referred to as unit cells) are stacked inside the module case. In the present embodiment, the plurality of battery modules 41 are arranged in parallel and fixed to the surface of the bottom frame 31 such that the main surfaces 411 of the plurality of battery modules 41 are perpendicular to the surface of the bottom frame 31.

In other words, the plurality of battery modules 41 are arranged in parallel and fixed to the surface of the bottom surface frame 31 such that the side surfaces 412 of the plurality of battery modules 41 are in contact with the surface of the bottom surface frame 31. By arranging the plurality of battery modules 41 in a row in this manner, all the battery modules 41 can be brought into contact with the bottom surface frame 31, and all the battery modules 41 can be cooled without omission.

As shown in fig. 2, the battery frame 3 of the present embodiment is attached to substantially the entire surface of the floor back surface 21 of the automobile body 2 ranging from the front portion of the front floor 23 to the rear floor 24. Further, reference numeral 22 denotes a dash panel, and reference numeral 25 denotes a side sill. As shown in fig. 1, in the battery frame 3 of the present embodiment, the batteries 4 shown in the lower left of fig. 1 are mounted in 5 sections from the front divided by the partition plates 36, and the batteries 4 in which a smaller number of battery modules 41 are arranged are mounted in the rearmost section divided by the partition plates 36.

As shown in fig. 1, the refrigerant cycle 5 of the present embodiment includes a flow path 51 through which a liquid refrigerant flows, a pump 52 through which the liquid refrigerant flows, a cooler 53 that cools the liquid refrigerant, and a refrigerant tank 54. As the liquid refrigerant of the present embodiment, an antifreeze (long-life coolant LLC) containing ethylene glycol as a main component or the like can be used. Although not shown, the cooler 53 exchanges heat with a refrigerant of a cold air cycle of an automobile air-conditioning apparatus mounted in an automobile, thereby cooling a liquid refrigerant including an antifreeze.

The battery frame 3 thus configured is attached to the floor back surface 21 of the automobile body 2 using a plurality of brackets 37 as shown in fig. 3 after the upper surface is closed with the cover 38. Specifically, as shown in fig. 3, the right and left sides of the battery frame 3 are attached to a side sill inner panel 251 or a side sill outer panel 252 of the side sill 25, which is a structural member of the automobile body 2.

As shown in fig. 6, the rear end portion of the battery frame 3 is attached to a bracket 261 of the rear floor side member 26, which is a structural member of the automobile body 2, using a bracket 37. The front end edge of the battery frame 3 is also directly or indirectly attached to a structural member of the front floor panel. Therefore, the battery frame 3 itself is mechanically fixed to the entire six surfaces by the bottom surface frame 31, the side surface frames 32 to 35, and the cover 38, and thus becomes a firm object fixed to the floor back surface 21 of the automobile body 2.

Next, the rear suspension assembly 61 for supporting the rear suspension 6 will be described. Although the rear suspension 6 is not shown in detail, the rear suspension 6 is a suspension device including suspension arms supporting a rear wheel, a coil spring, a damper (damper), and a torsion bar and a lateral thrust bar as necessary, and the damper is shown as the rear suspension 6 in the side view of fig. 10. The form of the rear suspension 6 of the automobile 1 of the present invention is not particularly limited, and various forms of rear suspensions can be applied.

The rear suspension 6 is supported by a rear suspension assembly 61, and the rear suspension assembly 61 is attached to the rear floor side member 26. The rear floor side member 26 is a structural member of the automobile body 2, extends from a front end to a rear end, and is fixed to both left and right sides of the floor back side of the rear floor 24 by welding or the like.

Fig. 7 is a bottom view showing a back side of a floor panel including a battery frame and a rear suspension of an automobile according to the present invention, fig. 8 is a bottom view showing the battery frame and the rear suspension of fig. 7 extracted, fig. 9 is a top view showing the battery frame and the rear suspension of fig. 7 extracted, fig. 10 is a side view showing the battery frame and the rear suspension of the automobile according to the present invention, fig. 11 is a view taken along the XI direction of fig. 9, and fig. 12 is a cross-sectional view taken along the XII-XII line of fig. 11.

The rear suspension assembly 61 is a structural member formed by joining a plurality of steel plates formed by press working by welding or the like, and includes, as shown in the plan view of fig. 9: a 1 st rear suspension 62 formed by bending so as to suspend the left front mounting portion 621 and the rear mounting portion 622; a 2 nd rear suspension 63 formed by bending so as to suspend the front mounting portion 631 and the rear mounting portion 632 on the right side; and two 3 rd

rear suspensions

64, 64 that suspend the 1 st rear suspension 62 and the 2 nd rear suspension 63, respectively, in the front and rear of the vehicle.

The rear suspension assembly 61 is mounted to the rear floor side member 26 at left and right

front mounting portions

621, 631 and left and right

rear mounting portions

622, 632. In this case, spacers (not shown) and the like are interposed between the left and right

front mounting portions

621, 631 and the rear floor side member 26, and between the left and right

rear mounting portions

622, 632 and the rear floor side member 26.

Further, a stay panel (pin tray) 65 extending toward the front of the vehicle is fixed to the front portions of the 1 st rear suspension 62 and the 2 nd rear suspension 63 by welding or the like. The stay 65 is a component formed by press working a steel plate, but is a member different from the 1 st and 2 nd

rear suspensions

62 and 63, and constitutes the 1 st weak portion of the rear suspension assembly 61. Therefore, the strut plate 65 in the rear suspension assembly 61 is set to have a strength that is first buckled at the time of a rear collision.

In the rear suspension assembly 61 of the present embodiment, the 1 st attachment portion 66 is provided at the distal end of the kicker plate 65. The 1 st mounting portion 66 is positioned further toward the vehicle front side than the left and right

front mounting portions

621, 63, and the rear suspension assembly 61 is mounted to the battery frame 3 at the 1 st mounting portion 66.

That is, as shown in fig. 11 and 12, bolt holes (not shown) through which the bolts 67 are inserted are formed in the distal end portions of the spacer plates 65. On the other hand, brackets 39, in which bolt holes (not shown) through which bolts 67 are inserted are similarly formed, are fixed to the left and right sides of the rear portion of the battery frame 3 by welding or the like. Bolt holes of the stay baffle 65 and bolt holes of the bracket 39 are formed at corresponding positions so that bolts 67 can penetrate therethrough. As shown in fig. 11 and 12, the first mounting portion 66 at the distal end of the spacer 65 is mounted to the bracket 39 of the battery frame 3 using a bolt 67 and a nut 68. Note that 69 is a pallet nut which prevents the nut 68 from following up when the bolt 67 is screwed in.

The bolt 67 of the present embodiment is provided to have a strength of a weak portion constituting the contact stay 65 of the rear suspension assembly 61. That is, the rear suspension assembly 61 is set to have such strength that the stay 65 is buckled in the rear collision.

In the automobile of the present embodiment, the rear suspension assembly 61 is attached to the rear floor side member 26 at 4 points of the left and right

front attachment portions

621, 631 and the left and right

rear attachment portions

622, 632. The 1 st mounting portions 66 provided forward of the left and right

front mounting portions

621 and 631 are mounted to the left and right rear end portions of the battery frame 3, and the rear suspension assembly 61 is mounted to the automobile body 2 at a total of 6 points.

As described above, the automobile 1 according to the present embodiment includes: a battery frame 3 that is attached to a side member 25, a rear floor side member 26, and the like, which are structural members of the floor back surface 21 of the automobile body 2, and that houses the battery 4; and a rear suspension assembly 61 that supports the rear suspension 6 and is attached to the rear floor side member 26, wherein the rear suspension assembly 61 is attached to the rear floor side member 26 at least at the left and right

front mounting portions

621, 631 and the left and right

rear mounting portions

622, 632, and is attached to the battery frame 3 at the 1 st mounting portion 66 on the vehicle front side of the left and right

front mounting portions

621, 631.

The battery frame 3 itself is mechanically fixed to the entire six surfaces by the bottom surface frame 31, the side surface frames 32 to 35, and the cover 38, and therefore becomes a strong object fixed to the floor back surface 21 of the automobile body 2. Therefore, even if the left and right front ends of the rear suspension assembly 61 are attached to the automobile body 2 without using a sub-frame or the like of another component, the battery frame 3 has a strength equivalent to that of such a sub-frame, and therefore, the weight reduction due to the reduction in the number of components can be achieved without impairing the steering stability. In addition, by attaching the 1 st mounting portion in front of the rear suspension assembly to the battery frame, the battery frame can be expanded rearward to the rear suspension position. As a result, the battery can be mounted in front of the rear suspension without interfering with the rear suspension.

In the automobile 1 according to the present embodiment, the left and right side portions of the battery frame 3 are attached to the side members 25 of the automobile body 2, the left and right rear end portions of the battery frame 3 are attached to the rear floor side member 26, and the 1 st mounting portions 66 of the rear suspension assembly 61 are attached to the left and right rear end portions of the battery frame 3, respectively. That is, the battery frame 3 itself is mechanically fixed to the entire six surfaces by the bottom surface frame 31, the side surface frames 32 to 35, and the cover 38, and thus becomes a strong object fixed to the floor back surface 21 of the automobile body 2. Therefore, the weight reduction due to the reduction of the number of parts can be achieved without impairing the steering stability. In addition, the battery can be mounted in front of the rear suspension without interfering with the rear suspension.

In addition, according to the automobile 1 of the present embodiment, the rear suspension assembly 61 includes: a 1 st rear suspension 62 suspending the left front mounting portion 621 and the rear mounting portion 622; a 2 nd rear suspension 63 suspending the front side mounting portion 631 and the rear side mounting portion 632 on the right side; and 3 rd

rear suspensions

64, 64 from which the 1 st rear suspension 62 and the 2 nd rear suspension 63 are suspended, the 1 st mounting portion 66 being provided to a stay plate 65 extending from respective front portions of the 1 st rear suspension 62 and the 2 nd rear suspension 63 toward the front of the vehicle, respectively, and the 1 st mounting portion 66 being mounted to brackets 39 fixed to left and right rear end portions of the battery frame 3, respectively, by means of bolts 67 and nuts 68. Thus, the weight reduction due to the reduction of the number of parts can be achieved without impairing the steering stability. In addition, the battery can be mounted in front of the rear suspension without interfering with the rear suspension.

In addition, according to the automobile 1 of the present embodiment, the stay 65 is a member different from the 1 st rear suspension 62 and the 2 nd rear suspension 63, and constitutes the fragile portion of the rear suspension assembly 61. As a result, the stay plate 65 of the rear suspension assembly 61 is first buckled at the time of a rear collision, and therefore, the collision impact can be absorbed mainly only by the stay plate 65.

In addition, according to the automobile 1 of the present embodiment, the bolt 67 used in the 1 st mounting portion 66 constitutes the weak portion of the contact stay 65 of the rear suspension assembly 61. Thus, at the time of a rear collision, the bolt 67 is buckled next to the stay plate 65 in the rear suspension assembly 61, and therefore, the collision impact can be absorbed mainly by the stay plate 65 and the bolt 67.

Description of the reference numerals

1. An automobile; 2. an automotive body; 21. a back side of the floor; 22. a dash panel; 23. a front floor; 24. a rear floor; 25. a side beam; 26. a rear floor side member; 261. a support; 3. a battery frame; 31. a bottom surface frame; 31A, 31B, 31C, 31D, 31E, 31F, sub-bottom frames; 311. an upper plate; 312. a lower plate; 313. a hollow portion; 314. a rib; 32. 33, 34, 35, side frames; 321. a rib; 36. a partition plate; 37. a support; 38. a cover; 39. a support; 4. a battery; 41. a battery module; 411. a main face; 412. a side surface; 5. a refrigerant circulator; 51. a flow path; 52. a pump; 53. a cooler; 54. a refrigerant tank; 6. rear suspension; 61. a rear suspension assembly; 62. 1 st rear suspension member; 621. a front side mounting part; 622. a rear side mounting portion; 63. the 2 nd rear suspension member; 631. a front side mounting part; 632. a rear side mounting portion; 64. a 3 rd rear suspension member; 65. supporting a baffle plate; 66. 1 st installation part; 67. a bolt; 68. a nut; 69. and a supporting plate nut.

Claims

1. An automobile, comprising:

a battery frame that is attached to a structural member on the back side of the floor of an automobile body and that houses a battery; and

a rear suspension assembly supporting the rear suspension and mounted to the rear floor side member,

the rear suspension assembly is mounted to the rear floor side member at least at each of left and right front side mounting portions and each of left and right rear side mounting portions,

the rear suspension assembly is mounted to the battery frame at a 1 st mounting portion located closer to the vehicle front than the left and right front side mounting portions.

2. The automobile according to claim 1, wherein,

the left and right side parts of the battery frame are mounted on side beams of the automobile body,

the left and right rear end portions of the battery frame are attached to the rear floor side member,

the 1 st installation part of the rear suspension assembly is respectively installed at the left and right rear end parts of the battery frame.

3. The automobile according to claim 2, wherein,

the rear suspension assembly includes: a 1 st rear suspension for suspending the front side mounting portion and the rear side mounting portion on the left side; a 2 nd rear suspension for suspending the front side mounting portion and the rear side mounting portion on the right side; and a 3 rd rear suspension for suspending the 1 st rear suspension and the 2 nd rear suspension,

the 1 st mounting portion is provided to a kicker plate extending from the front portion of each of the 1 st rear suspension and the 2 nd rear suspension toward the front of the vehicle,

the 1 st mounting part is mounted to brackets fixed to left and right rear end portions of the battery frame, respectively, by means of bolts and nuts.

4. The automobile according to claim 3,

the stay plate is a member different from the 1 st rear suspension and the 2 nd rear suspension, and constitutes a fragile portion of the rear suspension assembly.

5. The automobile according to claim 4,

the bolt constitutes a frangible portion of the rear suspension assembly that follows the kicker plate.